Exercices élémentaires en physiologie . andseparate possible la jambe du corps à l'pelvienne fémoro-joint. Déposerle une peau autant que le pied. Avec la pince écraser le gastrocnemiusmuscle Aehilles le tendon de près. Voir que la fin de l'nerveis coupée en carré. Avec un petit pinceau ou une fine tige de verre ascenseur thenerve très soigneusement de façon à ce que sa section peuvent fallupon la partie lésée du muscle. Cela stimule le nerveand provoque une contraction du muscle en raison de la soi-disant demar-cation des courants. 53 XX LA BOBINE D'INDUCTION 288. Machine à induction ou Inductobium. Principe

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Elementary exercises in physiology . possible andseparate the leg from the body at the femoro-pelvic joint. Removethe skin a far as the foot. With the forceps crush the gastrocnemiusmuscle near the tendon of Aehilles. See that the end of the nerveis cut off squarely. With a small brush or thin glass rod lift thenerve very carefully in such a way that its cross-section may fallupon the injured portion of the muscle. This stimulates the nerveand causes a contraction of the muscle due to the so-called demar-cation currents. 53 XX THE INDUCTION COIL 288. Induction Machine or Inductobium. Principle ofaction: If portions of the wires forming two separate circuits beplaced parallel to each other, as in the ease of the planes of twospirals or coils of the inductorium, the one wire primary (P), beingconnected with a source of electricity (battery), the other, the sec-ondary (S), being simply a closed circuit; whenever the P circuitis closed (made), or is opened (broken), currents will at thosemoments be induced in the S circuit.. Fig. l.S. Induction coil, ab, binding posts for single induced currents; od, binding posts for interrupted currents; e, post connecting Neefs hammer withthe primary coil; /, electro-magnet; p, primary coil; s, secondary coil. The make induction current flows in the S circuit in a directionopposite to that of the P circuit: whilst the break induction currentflows in the same direction as the original battery current. Theseinduction currents are of very short duration. Place the induction machine lengthwise in front of you on thetable with the interrupter turned to the right. In the DuBoisReymond type the wires are wound into two separate coils: The P 84 eoil which is supported by a woodten upright attached to the base ofthe instrument is composed of relatively thick wire, while the S coilmounted upon a sliding foot is composed of very thin wire, in thiscase invisible, as it has a protective covering of vulcanite. The parallelism of the wire in the two

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